Cylinder-grinding attachment for lathes.



No. 844,265. VPATENTED FEB. 12, 1907.

v G. P. DORRIS. CYLINDER GRINDING ATTAGHMENT'FOR LATHBS.

APPLICATION FILED JAN. 2, 1906.

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No. 844,265. PATENTED FEB. 12, 1907.

. G. P. mums.

CYLINDER GRINDING ATTACHMENT FOR LATHES.

APPLIGATION FILED JAILZ, 1906.

2 SHBETSSHEET 2.

- partly in longitudina my attachment applied thereto. Fig. II is' rmirnn STATES GEORGE r. Donnie, or ST. LOUIS, MISSOURI, Assienon To DORRIS MOTOR PATENT orrion.

CAR COMPANY, OF ST. LOUIS, MISSOURI, CORPORATION.

Specification of Letters Patent.

' Patented Feb. 12, 1907.

Application filed January 2, 1906- Serlal Ne. 294,079.

have invented certain new-and useful Im provements in Cylinder Grinding Attachments for Lathes, of which the following is a full, clear, and exact description, reference being had to the accom anying drawings,

forming part of this speci cation.

My invention relates to an attachment for application to lathes for use in grinding cy inders interiorly; and it has for its object to-provide rinding mechanism of this character by which the desired work may be speedily and accurately accomplished.

Figure I is a view, artly in elevation and l section, of a lathe and an enlarged longitudinal section of the grind- I ing-Wheel supporting and driving members of the attachment and the grinding-wheel. Fig. III is a view, artly in vertical cross- ,section, taken on line III III, Fig. II, looking. in the direction of the arrow crossing said line and showing the grindir'ig-wheel-shaftsupporting members in elevation. Fi IV is aqview, partly in section, ofthe flexible connection between the grinding-wheel shaft and its I driving-shaft.. Fig. V is a perspective View of one of the adjustable bearing-blocks, in which the grinding-wheel shaft operates. A designates the spindle-frame of a lathe, in which the hollow spindle B is-rotatably mounted, as usual. The spindle B has fixed to it the usual pulley C, to which power isa plied for the purpose ofdriving the spind e.

1 designates a barrel secured to the lathespindle B, either detachably or ermanently, but preferablydetachably. This barrel extends in alinement with the spindle and preferably has an internalrflan e at its outer end, as seen at 2, Figs. II and II '55 designates a pair of bearin blocks that mate with each other and whic are ad justably supported at the outer end of the barrel 1', so that they may be moved transversely of said barrel. Each of these bearing-blocks is provided with an aperture 4 and has therein adjacent to said. aperture a concave seat 5, which is adapted. to register with the concave seat in the other block to furnish a circular pocket in which a member, to be hereinafter mentioned, fits and operates. Each bearingblock 3 isalso rovided with slots 6 and 7, that respectively receive binding-screws 8 and 9, by which the bearing-blocks are secured to the barrel 1, preferably by screwing them into the flange 2 of the barrel 1 after they are passed through said slots. It will be seen that when the binding-screws are loosened the mating bearing-blocks may be .shifted transversely of the barrel 1 to the degree permitted by the slots in said blocks in whic the binding-screws are fitted.

10 is an adjustment-ring surrounding the bearingblocks 3, and 11 are adjustmentscrews which pass through said ring and are adapted to bear against the ends of the bearing blocks for the purpose of securing any desired degree of adjustment of said blocks when the bindingscrews 8 and 9 are in loosened condition.

12 designates a grinding-wheel-carrying shaft that extends longitudinally through the barrel 1 and through the apertures 4 in the bearing-blocks 3.

14 is a bearing-sleeve fitted to the grinding-wheel shaft 12 and preferably having a bulged circular central portion that is fitted in the pocket produced by the assemblage of the concave seats 5 in the bearing-blocks 3. The bearing-sleeve 14. is preferably restricted from inward movement on the shaft 12 by a rim 13, forming a part of said shaft, as seen in Fig. II.

15 is a grinding-wheel that is suitably secured to the outerend of the shaft, 12 and which is adapted to be rotated with. said shaft; The grinding wheel is preferably held between two collars 16 and 17, the

former of which bears against the bearing sleeve 14 and the latter of whichis held by a nut 18, that is applied to the extremity of the shaft 12.

19 designates a drive-shaft that extends longitudinally through the lathe-spindle B and which'has driving connection with the grinding-wheel shaft 12. This driving con- ,nection is preferably secured through the medium of a hollow coupling member 20, secured to the driving-shaft and containing a Ice swivel-pin 21, to wh1ch is flexibly fitted the .inner forked end 12 of the grinding-wheel shaft :12,that extends into said coupling member, and is preferably of .ball shape in order that said grinding-wheel shaft may move universally relative to the drivingshaft. The coupling member 20 is preferably loosely seated in a bushing-22,set into the lathe-s])i11dle. (See Fig. 11.) The rear end of the. driving-shaft 19 is loosely mounted in a bushing 23. seated in the rear end. of the spindle 15'. (See Fig. 1..)

24 is a pulley to which power may be communicated for the purpose of transmitting motion to the driviug-shaf-t 19 to rotate the grinding-wheel shaft and the grinding-Wheel carried thereby.

i) (see Fig. l) designates a cylinder such as may be ground by the use of my attachment and which may be held in position while being ground by seatim it into a jig or holder E. This cylinder-ho der is supported by a "movable bed F, with whlch are associated feed-screws of any suitable descri )tion for the purpose of imparting longitu inal and transv e1 se feed to the holder to properly feed the cylinder to the grinding-wheel when it is operating within the cylinder with grinding action in order that the cylinder may be dressed 'interiorly to any desired depth and any desired interior diameter.

it will be readily erceived that in the use of my attachment the position of the rindin -wheel 15 relative to the axis of the lathespindle B and the barrel 1, carried thereby, may be secured by adjusting the bearing blocks 3, in which the grinding-Wheel shaft 12 operates, transversely of said barrel and that due to such adjustment the grindingwheel may be caused to grind in a circular path of greater or less dimension, as may be desired. During .the operation of the attachment the barrel 1 rotates with the lathespindle, and the grinding-Wheel and its shaft are carried with said barrel and move in a )ath eccentric to the axis of the spindle and 'an'el. At the same time the grindin wheel is independentlyrotated through the medium of its shaft and the driving-shaft 19,

to which power is communicated separately from the lathe-spindle, and as a consequence as the grinding-Wheel enters into the cylinder to be ground and operates therein it acts to grind or dress the interior of said cylinder to a degree that is governed by the adjustment of the adjustable bearing-blocks.

I claim as my invention- 1. In a grinding device of the character described, the combination of a spindle, a grindin -wheel shaft, adjustable means suported by said spindle for holding said grind .ing-wheel shaft out of alinement with the axis of said spindle, a grinding-wheel carried by said shaft, and adrive-shaft having lexible connection with said grinding Wheel shaft, substantially as set forth.

2. In a grinding device of the character described, the combination of a spindle, an

adjustable bearing-block supported bysaid s indie, means for ad usting said bearingb ock transversely of said s indie, a grindingwheel shaft seated in said )earing-blwk and. confined therein out of alinement with the axis of said spindie, a grinding-wheel carried by saidshaft, and means for driving said grinding-wheel shaft, substantially as set forth.

3. in a grinding device of the character described, the combination of a spindle, a air of adjustablebearing-blocks supported 1y said spindle, means for adjusting said bearing-blocks transversely of'said s indle, a winding-Wheel shaft seated in said bearinglocks and confined therein out of alinement with the axis of said spindle, a grind- GEORGE P. DORE-IS.

In presence of i E. S. KNIGHT, NELLIE V. ALEXANDER. 

